var selected = null;
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function preloadImages() {
	if (document.images) {
		var img1 = newImage("CFL_on.gif");
		var img2 = newImage("CD_on.gif");
		var img3 = newImage("ACF_on.gif");
		var img4 = newImage("SN_on.gif");
		var img5 = newImage("SP_on.gif");
		var img5 = newImage("go_on.gif");
		var img6 = newImage("help_on.gif");
		//switchImage(selected, "over")
	}
}
function switchImage(imgName, state) {
	
	
	if (! document[imgName]) {
alert("no image!");
		return true;
	}
	var img =  document[imgName];
	window.status = "";
	
	var str = img.src;
	var suffix = ".gif";
	if (state == "over") {	
		suffix = "_on.gif";
		window.status = img.alt;
	} else if (selected != null && imgName == selected) {
		return true; 
	}
	
if (img.src.toLowerCase().indexOf("_on") > -1) {
	str = str.substring(0, str.lastIndexOf("_"));
	img.src = str + suffix;
} else {
	str = str.substring(0, str.lastIndexOf("."));
	img.src = str + suffix;
}
return true;
}